TALANTA
·
2015
·
IF 3.545
Wen Sun,Hui Li,Han Wang,Shan Xiao,Jihui Wang,Liang Feng
The sensitivity of pH indicators is always confined in acidic solvents used during the immobilization because of the large deviation from their color transition points. By regulating the pH of indicators using organic acid or base, the color transition points of indicators could be readily achieved and the sensitivity could be greatly enhanced. In this study, bromophenol blue was selected as an example to interpret this improvement. And Hue, Saturation and Value (HSV) color model was applied to obtain digital color information of pH indicators. In addition, other two kinds of pH indicators were chosen and regulated to their color transition points as well. The resultant indicators together with the original ones were composed to a colorimetric sensor array and utilized to determine fish freshness. Compared with the original indicators, much higher sensitivity in the detection of fish freshness was obtained by the pH regulated indicators.
研究领域:
食品科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 20
·3636
·
IF 5.719
Jianchao Gong,Tingting Wang,Wei Zhang,Lin Han,Mingxiao Gao,Tianen Chen,Tao Shen,Yaxiong Ji
To explore the effect of spacer structure on the adsorption capability of organo-vermiculites (organo-Vts), a series of aza-containing gemini surfactants (5N, 7N and 8N) are applied to modify Na-vermiculite (Na-Vt). Large interlayer spacing, strong binding strength and high modifier availability are observed in organo-Vts, which endow them with superiority for the adsorption of 2-naphthol (2-NP) and bromophenol blue (BPB). The maximum adsorption capacities of 5N-Vt, 7N-Vt and 8N-Vt toward 2-NP/BPB are 142.08/364.49, 156.61/372.65 and 146.50/287.90 mg/g, respectively, with the adsorption processes well fit by the PSO model and Freundlich isotherm. The quicker adsorption equilibrium of 2-NP than BPB is due to the easier diffusion of smaller 2-NP molecules into the interlayer space of organo-Vts. Moreover, stable regeneration of 7N-Vt is verified, with feasibility in the binary-component system that is demonstrated. A combination of theoretical simulation and characterization is conducted to reveal the adsorption mechanism; the adsorption processes are mainly through partition processes, electrostatic interaction and functional interactions, in which the spacer structure affects the interlayer environment and adsorptive site distribution, whereas the adsorbate structure plays a role in the diffusion process and secondary intermolecular interactions. The results of this study demonstrate the versatile applicability of aza-based organo-Vts targeted at the removal of phenols and dyes as well as provide theoretical guidance for the structural optimization and mechanistic exploration of organo-Vt adsorbents.Keywords:organo-vermiculite;aza-containing gemini surfactant;2-Naphthol;bromophenol blue;adsorption
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yanke Li,Huilin Liu,Runda Nie,Yue Li,Qinglin Li,Yunfeng Lei,Mingming Guo,Yichuan Zhang
Graphene oxide nanosheets (GONs) treatment of anionic dyeing wastewater has been characterized by low removal efficiency due to its electronegativity. However, further modification and enhancement of graphene oxide make it difficult to balance cost and efficiency. Herein, we report an economical, practical, and environmentally friendly composite aerogel of GONs and chitosan (CS) in anionic dye adsorption. The abundant oxygen-containing functional groups on the surface of GONs may form hydrogen bonds with dye molecules. Meanwhile, the amino-positive active sites on the chain segments of CS molecules may anchor anionic dyes. The adsorption capacities of composite aerogel for methyl orange (MO) and bromophenol blue (BPB) anionic dyes by electrostatic attraction, hydrogen bonds, and π-π conjugate interactions are 3.7 and 1.8 times than that of pure CS aerogel from the adsorption results, respectively. Moreover, the maximum adsorption capacities of composite aerogel for MO and BPB are 179.21 and 236.42 mg g −1 at room temperature and in a neutral environment. Therefore, this simple and cost-effective graphene aerogel anionic dye adsorbent may be used for the protection of the water environment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Muthuchamy Maruthupandy,Govindan Rajivgandhi,Thillaichidambaram Muneeswaran,Seerangaraj Vasantharaj,Gabriela Sandoval-Hevia,Muniyandi Muneeswaran,Nurul Asyikin Binti Mohamed Radzi
The pervasive occurrence of various organic contaminants, primarily dye molecules, in water bodies was caused by multiple dye industrial wastes, which recently sparked great scientific concern and public awareness due to their potential to spread these contaminants' resistant genes and pose a risk to humans. Cross-linking graphene in chitosan resulted in nanocomposites with varied morphology, increased surface area, and improved photocatalytic removal of bromothymol blue and bromophenol blue. The degradation capacity of photocatalysts at various concentrations (25 and 50 mg) was 96.2 % (170 min) and 99.2 % (80 min) with bromothymol blue, revealing a two-fold variation based on the Gr/Cts NCs concentrations. Similar to bromophenol blue dye molecules, which showed a two-fold enhancement of degradation based on graphene/chitosan nanocomposites concentration, bromophenol blue dye molecules were 95.3 % and 98.6 % at 240 and 120 min time intervals. The bromophenol blue and bromothymol blue dyes degraded according to the Langmuir adsorption model. Furthermore, the minimal cytotoxicity of graphene/chitosan nanocomposites to the human lung epithelial cell line and the human macrophage-like cell line indicates that the material is safe. This study reveals that the degrading properties of graphene/chitosan nanocomposites significantly improve as the concentration increases.
研究领域:
环境科学
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材料科学
·
生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Nanomaterials
·
2018
·
IF 2.207
Qian Liu,Penghui Ren,Xiaofei Wang,Yuanzuo Li,Yanhui Yang
Tetrabromophenol blue and Bromoxylenol blue as the sensitizers of dye-sensitized solar cells (DSSCs) are measured in experiments. In order to better understand the photoelectrical properties of the two dyes, we obtain the UV-Vis spectra, fluorescence spectra, and current-voltage characteristics. The frontier molecular orbital, energy levels, the first hyperpolarizability, the first hyperpolarizability density, and molecular electrostatic potential are calculated with density functional theory (DFT) and time-dependent DFT (TDDFT). The critical factors including the light harvesting efficiency (LHE (Tetrabromophenol blue for 0.0284 and Bromoxylenol blue for 0.0290), the driving force of electron injection (ΔGinject), x-axis direction dipole moment (μnormal), the conduction band of edge of the semiconductor (ΔECB), and the excited-state lifetime (τ)) are computed, which have a close connection to the short-circuit current density (Jsc) and open-circuit voltage (Voc). The results show that the Jsc (0.09 mA/cm2) and Voc (0.39 V) of Tetrabromophenol blue have larger values, which can be explained by a larger absolute value of ΔGinject, absolute value of μnormal, τ, and ΔECB. Therefore, Tetrabromophenol blue displays well photoelectric conversion efficiency compared with Bromoxylenol blue.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yang Xiang,Manglai Gao,Tao Shen,Gaili Cao,Bingbing Zhao,Shangxin Guo
In this paper, an imidazolium-based gemini surfactant [C 14 -4-C 14 im]Br 2 was fabricated as modifiers of vermiculite, silica nanosheets (from acid treating vermiculite) and montmorillonite . The modified clays were characterized with FT-IR, XRD, TG, EA , SEM and Washburn capillary rise method and investigated regarding the adsorption capacity for bromophenol blue (BPB). These organo-clays under similar availability of modifier show efficient removal for BPB with the order: C 14 -4-C 14 im-Vt > C 14 -4-C 14 im-SiNSs > C 14 -4-C 14 im-Mt. The adsorption processes are discovered fitting pseudo-second-order kinetics and Langmuir isotherm models. The q max of organo-Vt, organo-SiNSs and organo-Mt calculated with Langmuir isotherm model are 400.19, 230.77 and 220.27 mg g −1 , respectively, which prove organo-clays with imidazolium surfactants acquiring superior adsorbability to other known adsorbents. The adsorption capacity get higher with lower pH value and perform a positive correlation with the wettability . It can be concluded that electrostatic and hydrophobic interactions paly critical roles during the process. C 14 -4-C 14 im-SiNSs possesses higher adsorption efficiency ( R = 99.53% at pH = 2, C 0 = 200 mg L −1 ) noticeably. These provide some ideas for the use of imidazole-containing surfactants in modifying clays for contaminant treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3101-3109
·
IF 4.831
Li Shuhuai,Liu Chunhua,Yin Guihao,Luo Jinhui,Zhang Zhenshan,Xie Yixian
The authors describe an electrochemical sensor for the neonicotinoid insecticide imidacloprid (IMI) based on Pt-In catalytic nanocomposite film and Bromophenol blue amplification. The Pt-In nanocomposite film was deposited on the surface of a modified glassy carbon electrode. The composite molecularly imprinted polymer (MIP) was prepared by electro-polymerization using bromophenol blue doped o -aminophenol as functional monomer and 4-tert-butylcalix[6]arene-IMI supramolecular inclusion complex as template molecule. The experimental results showed that the current intensity of IMI was clearly amplified in the potential range from −0.3 to −1.8 V, because of the double amplification, based on the Pt-In film and Bromophenol blue catalysis. Moreover, the double recognition ability of the sensor, which relied on the MIP and the vacuum structure of 4-tert-butylcalix[6]arene, effectively increased the specific recognition performance. The feasibility of its practical applications has been demonstrated by the analysis of vegetable samples.
A supramolecular imprinted electrochemical sensor for imidacloprid determination was prepared based on Pt-In nanocomposite film and bromophenol blue amplification. Because of the advantages of the specific recognition sites in MIPs and supramolecular chemistry, the sensor showed good selectivity for imidacloprid.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Meixia Wu,Jinbin Zhang,Yao Fan,Hengye Chen,Songtao Wang,Caihong Shen,Haiyan Fu,Yuanbin She
Baijiu authenticity has been a frequent problem driven by economic interests in recent years, so it is important to discriminate against baijiu with different origins. Herein, we proposed a simple and efficient esters-targeted colorimetric sensor array mediated by hydroxylamine hydrochloride. Esters undergo a nucleophilic addition reaction with hydroxylamine hydrochloride to form hydroxamic acid, which rapidly forms a purplish red ferric hydroxamate under FeCl 3 ·6H 2 O. Bromophenol blue and rhodamine B enrich the color effects. The array detected 12 esters with a detection limit on the order of 10 −5 of most esters and 16 mixed esters with R 2 > 0.999 and recoveries close to 100%. Otherwise, for discriminating 34 strong-aroma baijius (SABs), the array has an accuracy of 98% according to the origin, and 95% according to the grades, with a response time of 1 min. This study provides a new strategy for authenticity determination and quality control of baijiu.
研究领域:
化学
·
分析化学
·
食品科学
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Xiaojia Wang,Hongyu Zhu,Yina Yang,Guoqiao Lai,Xiongfa Yang
Food safety and food freshness issues have become important concerns for consumers and hydrogels with high antibacterial efficiency, low toxicity and pH−sensitive colorimetric intelligence are one of candidates to meet the requirement of food package and food spoilage monitoring. Nevertheless, hydrogels prepared only by assembling the ingredients with non−covalent interactions through time−consuming molding process usually encounter drawbacks such as relatively poor mechanical properties, stability and thermal stability, which always restrict their further applications. To overwhelm these shortcomings, UV−curable choline chloride (ChCl) and bromophenol red (BR) covalent functionalized antibacterial and pH−sensitive cross−linked hydrogels (UV−hydrogels) were developed in this paper. The UV−hydrogels possessed good thermal stability because the initiated thermal decomposition temperature (T d5 ) is in the range of 135.8–184.7 °C. The DMA analysis revealed that the UV−hydrogels are with good mechanical properties because the elongation at break is in the range of 117–525% and the tensile strength is in the range of 0.8–2.7 MPa. The UV−hydrogels with BR groups exhibited naked eye visible color variation from yellow to dark blue-green with the variation of the pH values from 2 to 14. The antibacterial efficiency of the UV−hydrogels against S . aureus , E . coli and M . albican increased with the increment of covalent−grafted ChCl amount. Cytotoxicity assay demonstrated that the UV−hydrogels are low toxicity against L929 cells. The experiment of monitoring freshness of beef denoted the UV−hydrogels have potential application in animal–derived high protein food packaging and freshness monitoring.
研究领域:
材料科学
·
食品科学
·
生物技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Zhi-Yong Wu,Yu-Hang Wang,Bing-Su Niu,Yu Yang,Fang Fang,Yan-Yan Song
In this paper, simultaneous enrichment and separation of ions and amphoteric components were successfully demonstrated by using electric field (E) and pH gradient (double gradient) in the ion depletion zone of anion concentration polarization interface established on a paper fluid channel. Experimental results were visualized with colored ions (bright blue and amaranth) and protein probes (phycocyanin and cytochrome C). With optimization, colored phycocyanin and bovine hemoglobin with similar pI as that of albumin and immunoglobulin respectively were well separated in 900 s with 10-fold enrichment effect. Based on the separation and enrichment function of this paper-based analytical device (PAD) and rapid selective staining of human serum albumin (HSA) with bromophenol blue , a rapid colorimetric detection of HSA was implemented with smartphone camera. A limit of detection (LOD) of 5.2 mg·L − 1 was achieved in the clinically significant range of 10–300 mg·L −1 (R 2 = 0.99). This method was applied to real human urine samples with good agreement (ɑ = 0.01) to clinical detection method (immunoturbidimetry). With the separation and enrichment functions of PAD, both the specificity and sensitivity were enhanced, which provides a solid basis for point-of-care test of microalbuminuria. Therefore, this PAD device is potential for sample pretreatment and detection of target components from complex physiological samples.
研究领域:
分析化学
·
即时检验
·
生物医学工程
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5583-5601
·
IF 3.917
Zhang Linya,Xue Wei,Gu Limin
Abstract The paper presented a new, non-pollution macromolecule of adsorbing acid dyes, and developed the adsorption mechanism on the basis of effect between the modified groups of hyperbranched hemicellulose polymer and acid dyes. The modified hyperbranched hemicellulose polymer (HHP) with a large number of terminal carboxyl groups and hydroxyl groups was synthesized by hemicellulose maleate and dihydroxymethyl propionic acid. The degree of substitution, kinematic viscosity and thermal stability of HHP was determined. In SEM images, the HHP exhibited the pores and cross-linked structure which were good help for dye adsorption. When the HHP was applied in adsorbing Methyl red dye, Bromocresol green dye and Bromophenol blue dye, it exhibited higher adsorption capacity. The adsorption capacity changed with different adsorbent dosage, pH, temperature and ionic strength, and the optimal adsorption capacity for Methyl red dye, Bromocresol green dye and Bromophenol blue dye could reach 825 mg/g, 675 mg/g and 912 mg/g respectively. The adsorption mechanism, adsorption isotherm and adsorption diffusion mode were demonstrated by Pseudo-order model, Langmuir model, Intraparticle diffusion model and Memberance diffusion model respectively. The adsorption data possessed better correlation with Pseudo-second-order model, Langmuir model and Intraparticle diffusion model. The adsorption isotherms and thermodynamic date indicated the processes of HPP2 adsorbing three acid dyes were endothermic. The N 2 -adsorption/desorption isotherms of HPP2 revealed the hyperbranched hemicellulose polymer filled the pore in clusters, and its adsorption process met with monolayer adsorption. Graphical abstract
研究领域:
环境科学
·
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
Current Protocols
·
2025
·Vol. 5
·期 10
·e70241
·
IF 2.2
Yiming Zhao,Jingjun Hong
Chromatin remodeling is a process of regulating gene expression levels by altering chromatin structure, facilitated by chromatin remodeling factors. ISWI (Imitation SWItch), a type of chromatin remodeling factor, plays a crucial role in epigenetic regulatory processes, such as cell differentiation and development. It primarily achieves remodeling effects by promoting the direct sliding of nucleosomes and their relocation on DNA. To study the function and structural characteristics of ISWI, this basic protocol describes a simple and rapid procedure for the large-scale expression and purification of soluble Ct ISWI 77-1038 and Ct ATPase 77-722 proteins in Escherichia coli ( E. coli ). The procedure provides high yields (∼20 mg) and is followed by in vitro measurement of ATP hydrolysis activity. © 2025 Wiley Periodicals LLC. Basic Protocol : Expression, purification, and ATP hydrolysis activity measurement of Ct ISWI and Ct ATPase
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PubMed
高影响因子
危险品化学品经营许可证（带存储）